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#1 2011-07-04 19:20:35
- nTia89
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LVM increase performace ?
source: http://www.phoronix.com/scan.php?page=a … _lvm&num=1
i don't understand how LVM can increase performance in a single hd......
thanks
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#2 2011-07-05 06:55:15
- nTia89
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Re: LVM increase performace ?
do i post in right section ?
+pc: custom | AMD Opteron 175 | nForce4 Ultra | 2GB ram DDR400 | nVidia 9800GT 1GB | ArchLinux x86_64 w/ openbox
+laptop: Apple | MacBook (2,1) | 2GB ram | Mac OS X 10.4 -> DIED
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#3 2011-07-05 09:11:46
- outerdark
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Re: LVM increase performace ?
I guess some sort of caching or prealignment?
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#4 2011-07-05 09:19:53
- Damnshock
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Re: LVM increase performace ?
source: http://www.phoronix.com/scan.php?page=a … _lvm&num=1
i don't understand how LVM can increase performance in a single hd......
thanks
As the Phoronix article describes, barriers on ext4 are off in the LVM configurations. That might explain the difference in performance.
Regards
My blog: blog.marcdeop.com
Jabber ID: damnshock@jabber.org
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#5 2011-07-05 09:48:25
- nTia89
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Re: LVM increase performace ?
i understand in an "hardware" raid , with two fisical hd, that time for reading and writing in theory is half respect only one hd.
but in this case the hd is one......
+pc: custom | AMD Opteron 175 | nForce4 Ultra | 2GB ram DDR400 | nVidia 9800GT 1GB | ArchLinux x86_64 w/ openbox
+laptop: Apple | MacBook (2,1) | 2GB ram | Mac OS X 10.4 -> DIED
+ultrabook: Dell | XPS 13 (9343) | 8GB ram | 256GB ssd | FullHD display | Windows 8.1 64bit ArchLinux x86_64 w/ Gnome
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#6 2011-07-05 09:51:22
- SanskritFritz
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Re: LVM increase performace ?
Turning off barriers definitely increases performance even on one disk. But it is dangerous, read here: http://lwn.net/Articles/283161/
zʇıɹɟʇıɹʞsuɐs AUR || Cycling in Budapest with a helmet camera || Revised log levels proposal: "FYI" "WTF" and "OMG" (John Barnette)
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#7 2011-07-05 11:25:40
- nTia89
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Re: LVM increase performace ?
so, why use it with a LVM ?
+pc: custom | AMD Opteron 175 | nForce4 Ultra | 2GB ram DDR400 | nVidia 9800GT 1GB | ArchLinux x86_64 w/ openbox
+laptop: Apple | MacBook (2,1) | 2GB ram | Mac OS X 10.4 -> DIED
+ultrabook: Dell | XPS 13 (9343) | 8GB ram | 256GB ssd | FullHD display | Windows 8.1 64bit ArchLinux x86_64 w/ Gnome
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#8 2011-07-05 11:37:27
- Damnshock
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Re: LVM increase performace ?
so, why use it with a LVM ?
Why use what? ext4?
If you are worried about data integrety, LVM provides methods to guarantee it
Regards
My blog: blog.marcdeop.com
Jabber ID: damnshock@jabber.org
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#9 2011-07-05 13:55:32
- nTia89
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Re: LVM increase performace ?
ok, with barriers off speed increase but can cause problem so with LVM and snapshot feature i'm protected against this type of disaster, right ?
+pc: custom | AMD Opteron 175 | nForce4 Ultra | 2GB ram DDR400 | nVidia 9800GT 1GB | ArchLinux x86_64 w/ openbox
+laptop: Apple | MacBook (2,1) | 2GB ram | Mac OS X 10.4 -> DIED
+ultrabook: Dell | XPS 13 (9343) | 8GB ram | 256GB ssd | FullHD display | Windows 8.1 64bit ArchLinux x86_64 w/ Gnome
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#10 2011-07-05 14:36:45
- SanskritFritz
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Re: LVM increase performace ?
ok, with barriers off speed increase but can cause problem so with LVM and snapshot feature i'm protected against this type of disaster, right ?
No, snapshot gives you backups, but barrier protects against filesystem corruption.
@Damnshock: can you give us more info about LVM protecting us while barriers are turned off?
zʇıɹɟʇıɹʞsuɐs AUR || Cycling in Budapest with a helmet camera || Revised log levels proposal: "FYI" "WTF" and "OMG" (John Barnette)
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